Add proxy for camera

hosts/Aloria/hardware-configuration.nix

@@ -19,6 +19,7 @@
   boot.extraModprobeConfig = ''
     options thinkpad_acpi fan_control=1
     options v4l2loopback exclusive_caps=1 card_label="Android Virtual Camera"
+    options v4l2loopback exclusive_caps=1 video_nr=42 card_label="IPU6 Virtual Camera"
   '';
   # boot.kernelParams = ["ipv6.disable=1"];
 
@@ -63,4 +64,37 @@
   services.udev.extraRules = ''
     SUBSYSTEM=="intel-ipu6-psys", MODE="0660", GROUP="video"
   '';
+  systemd.services.ipu6-v4l2-proxy = {
+    description = "IPU6 Libcamera to V4L2Loopback Proxy";
+    # wantedBy = ["multi-user.target"];
+    after = ["systemd-udev-settle.service"];
+
+    serviceConfig = {
+      ExecStart = let
+        gstPluginPath = pkgs.lib.makeSearchPathOutput "lib" "lib/gstreamer-1.0" (with pkgs.gst_all_1;
+          [
+            gstreamer
+            gst-plugins-base
+            gst-plugins-good
+            gst-plugins-bad
+          ]
+          ++ [pkgs.libcamera]);
+      in ''
+        ${pkgs.gst_all_1.gstreamer}/bin/gst-launch-1.0 \
+          --gst-plugin-path=${gstPluginPath} \
+          libcamerasrc \
+            ! video/x-raw \
+            ! vapostproc contrast=1.3 saturation=1.4 brightness=-0.15 \
+            ! video/x-raw,width=1280,height=720 \
+            ! videoconvert \
+            ! gamma gamma=0.7 \
+            ! videoconvert \
+            ! video/x-raw,format=YUY2 \
+            ! v4l2sink device=/dev/video42
+      '';
+
+      Restart = "always";
+      RestartSec = "3";
+    };
+  };
 }